Tutorial Answers
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to Q60:  Sorry, your answer is not correct.  Be sure you do not confuse medium motion with wave motion.

Help: Fundamentals of Sound, Secs. 1-D, 1-G.
 
Or would you like a HINT ?

You should try to work out the answer on your own, but if you insist on reading it the correct answer is here

Return to Question 60
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 Hint for Question 60: The medium motion and the wave motion are the ideas in question here.  What is point B doing while the wave goes by?

Return to Question 60
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 60:  Congratulations, your answer is correct!

If you like, you can compare your answer to the "official" correct answer.
 
Return to Question 60
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Correct answer to Q60: While a wave moves to the right, point B is moving up to the maximum displacement, then back down to zero, and then to a negative displacement, and finally back to equilibrium. That is a complete cycle, carried out in one period, and describes the medium motion. b) is the correct answer.
 
Return to Question 60
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 65:  Sorry, your answer is not correct.  You should look up the definition of wavelength.

Help: Fundamentals of Sound, Secs. 1-D, 1-G.

Or would you like a HINT ?

You should try to work out the answer on your own, but if you insist on reading it the correct answer is here
 

Return to Question 65
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Hint for question 65:
Wavelength is the distance between two adjacent crests of a wave, as, for example, the peak to peak distance.
 
 
Return to Question 65
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 65:  Congratulations, your answer is correct!

If you would like, you can compare your answer to the "official" correct answer.

Return to Question 65
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Correct answer to Question 65: The distance from one peak to the next is 2 feet. You can also take the distance from any one point to the next precisely similar point, for example, from a zero where the wave is going up, to the next zero where it is again going up and has completed one cycle in space.
 
 Return to Question 65
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to Question 70:  Sorry, your answer is not correct.  You should look up the definition of amplitude.

Help: Fundamentals of Sound, Secs. 1-D, 1-G.

Or would you like a HINT ?

You should try to work it out on your own, but if you insist on reading it the correct answer is here.

Return to Question 70
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Hint for question 70:
Amplitude is the distance from the zero position (equilibrium or at-rest position) of any point to the point where is at a maximum distance away from equilirium.

Return to Question 70
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 70:  Congratulations, your answer is correct!

If you like, you can compare your answer to the "official" correct answer.
 
Return to Question 70
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Correct answer to question 70:
The amplitude is 1 foot. This is the distance from the at-rest position to the position of a peak of a wave. The correct answer is a).

 Return to Question 70
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 75:  Sorry, your answer is not correct.  You should look up the definition of period.

Help: Fundamentals of Sound, Secs. 1-D, 1-G.

Would you like a HINT?

You should try to work out the answer on your own, but if you insist on reading it the correct answer is here.
 
 Return to Question 75
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 ;
 Hint for question 75:
The period is the time for one complete cycle.
 
 Return to Question 75
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 75:  Congratulations, your answer is correct!

If you like, you can compare your answer to the "offical" correct answer.

Return to Question 75
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Correct answer to question 75: The period is the time for one complete cycle. Follow the point B as is moves up and then back down. It reaches its lowest point after 1.5 s, but that is not yet one complete cycle; it must next return back to its starting position, which it does by 2 seconds. The period is thus 2 seconds and the correct answer is d).

 Return to Question 75
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 78:  Sorry, your answer is not correct.   You should look up the definition of frequency.

Help: Fundamentals of Sound, Secs. 1-D, 1-G.

Or would you like a HINT?

You should try to work out the answer on your own, but if you insist on reading it, the correct answer is here.
 
 Return to Question 78
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Hint for question 78:
The frequency is the number of cycles occurring in one second (Hertz). Examine how many cycles (or fractions of a cycle) point B has undergone after one second.

Return to Question 78
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 78:  Congratulations, your answer  is correct!

If you like, you can compare your answer to the "official" correct answer.
 
 Return to Question 78
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Correct answer to question 78: After one second, point B has undergone only half a cycle, so that the the frequency is 0.5 Hertz. One can also use f=1/T = 1/(2 s) = 0.5 Hz.

Return to Question 78
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 80:  Sorry, your answer is not correct.  You should look up the definition of wave velocity.

Help: Fundamentals of Sound, Secs. 1-D, 1-G.

Or, would you like a HINT?

You should try to work out the answer on your own, but if you insist on reading it, the correct answer is here.

Return to Question 80.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Hint for question 80:
Wave velocity is the distance traveled divided by the time to travel that distance. Pick a point and see how far it travels in, say, 1 second.

Return to Question 80.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Your answer to question 80:  Congratulations, your answer is correct!

If you like, you can compare your answer to the "official" correct answer.

Return to Question 80.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Correct answer to question 80: The wave travels one wavelength in one period. Thus the wave velocity (distance over time) is 2 ft/2 s = 1 ft/s. Another way to do this is to use the formula velocity = frequency x wavelength = 0.5 Hz x 2 ft = 1 ft/s.
 
 Return to Question 80.
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 

 

 

 


ab_webmaster@abacon.com
©2002 William J. Mullin
Legal Notice